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Technical Focus: Feedforward Control of Coagulant Dosing using Phosphate Measurement

Posted by
Jessica Collins on
December 19, 2014

Implementing phosphate measurement at any point of the wastewater processing cycle is going to give you results, whether it be shocking or reassuring in regards to aspects such as material usage and power requirements.

Using phosphate measurement in a feedforward scenario in regards to removal of the salt can not only bring potential process issues to light before they can cause significant damage (such as a greater load within a continuous flow rate), but also increase the reliability of instruments further along in the chain.

An added benefit of using feedforward phosphate measurement as a control method is the increased efficiency of existing feedback control through the curbing of set point fluctuations. This decreases the chance of anomalous readings, and the additional secondary data can prove a useful tool in the happening of such incidents

The initial outlay of installing feedforward control in regards to coagulant dosing will actually pay for itself in due course; should a plant be using historical data (which is unreliable at the best of times) and unwittingly overdosing their processes, this step towards plant efficiency cuts back on unnecessary coagulant usage and avoids exceeding discharge consents.

The MicroMac C Colorimetric Analyser can assist in such process augmentation, and the Partech design team has included all of the necessary equipment (such as macerating submersible pump, controller and air compressor) to be able to undertake such control ownership.

To further improve the Partech catalogue and our services, we would be intrigued to know just how many of your processes utilise feedforward control of coagulant dosing (or any other similar control for that matter), so we can continue to move forwards ahead of the industry.

We’ve only scratched the surface of using phosphate measurement as a feedforward coagulant dosing control in terms of phosphate removal (other topics can be found here); please use the comment box below or get in touch to let us know of your personal feedforward experiences.